PHYSICAL PROPERTIES OF PADDY SOIL AS AFFECTED BY IRRIGATION POLLUTED BY PHYSICAL PROPERTIES OF PADDY SOIL AS AFFECTED BY IRRIGATION POLLUTED BY GOLD MINE TAILING. CASE STUDY IN DHARMASRAYA, WEST SUMATRA,INDONESIA

Yulnafatmawita, Yulnafatmawita and Yasin, Syafrimen and Maira, Lusi (2018) PHYSICAL PROPERTIES OF PADDY SOIL AS AFFECTED BY IRRIGATION POLLUTED BY PHYSICAL PROPERTIES OF PADDY SOIL AS AFFECTED BY IRRIGATION POLLUTED BY GOLD MINE TAILING. CASE STUDY IN DHARMASRAYA, WEST SUMATRA,INDONESIA. International Journal of Civil Engineering and Technology (IJCIET), 9 (9). pp. 1886-1897. ISSN 0976-6308 (Printed) and 0976-6316 (Online)

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Abstract

Irrigation source is one of factors affecting physical properties of paddy soil. This research was aimed to determine the impact of polluted irrigation on soil physical properties of rice field. The study site was located in Koto Nan IV (00o 54' 21.9" S and 100o 23’52.2" E), Dharmasraya Regency, West Sumatra, Indonesia. The rice field over there was irrigated with water from Momongan river in which people did gold mining illegally. For comparison, rice field receiving irrigation from non-polluted source nearby was also anaysed for the physical properties. The result showed that there was a change in physical properties of paddy soil after 7 years of getting irrigation from the river. Based on laboratory analyses, the total suspended solid (TSS) in the tailing reached 10,736 mg/L. The texture of paddy soil was dominated by sand (>50% at the top 100 cm soil depth), and it tended to linearly decrease (R2=0.65) by depth. Likewise, the sand particles also linearly decreased (R2=0.83) but clay particles linearly increased (R2=0.74) as the distance from the water input (terrace-1) became further. This sandy textured soil increased the hydraulic conductivity rate (by up to 19.1 times), soil bulk density (by 38%), and sharply decreased SOM (by 88.5 %), as well as soil total pore (by 22.1%) compared to the paddy soil receiving non-polluted irrigation at the top 20 cm soil. The rice field was suggested to be reclaimed before reusing it, otherwise the soil characteristics requirement, especially soil water retention, for rice field could not be fulfilled

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